TOPPING PA3s MA12070x2 fully Class D balanced amplifier TRS balanced RCA single-end input power amplifier 80wx2 hifi digital amp.

Topping offers with its PA3s a small balanced Class D amplifier, simple, powerful and affordable. It is based on two Infineon MA12070 amplifier chips and has two balanced and single-ended outputs.

 Class D balanced amplifier 2x MA12070

The PA3s is based on a pair of Infineon Merus MA12070 Class D amplifier chips, allowing to develop a power of 2x65W under 4Ω or 2x37W under 8Ω with high efficiency. Moreover, this balanced architecture, with one chip per channel, allows to reduce considerably the crosstalk for a precise restitution. The heat is dissipated by a large radiator covering the two amplifier chips.Balanced & single-ended inputs

The PA3s offers a dual input to suit all needs and systems. There is a single-ended stereo RCA input and a balanced dual 6.35mm TRS jack input. The use of the balanced input eliminates any possible ground loop problems to promote a clear sound. The inputs are selectable directly from the front panel button.Technical characteristics

SPECIFICATIONS

Product type

Amplifier

Amplifier type

Class D

Amplifiction chips

2x Infineon MA12070

Inputs

1x Single-ended stereo RCA
1x Balanced stereo Jack 6.35mm

Output

Speaker terminals

MEASUREMENTS

Single-ended input

Balanced input

THD+N @ 1kHz (A-Weighting)

< 0.005% @ 4Ω 5W

< 0.0045% @ 4Ω 5W

< 0.004% @ 8Ω 5W

< 0.004% @ 8Ω 5W

THD @ 20Hz-10kHz (20kBW)

< 0.008% @ 4Ω 5W

< 0.007% @ 4Ω 5W

< 0.007% @ 8Ω 5W

< 0.006% @ 8Ω 5W

SNR @ Max Out 1kHz, A-Weighting

107dB

112dB

Dynamic range @ 1kHz, A-Weighting

107dB

112dB

Frequency response

20Hz-40kHz (±0.1dB)

20Hz-40kHz (±0.1dB)

Output level

46Vpp @ 4Ω

46Vpp @ 4Ω

48Vpp @ 8Ω

48Vpp @ 8Ω

Noise (A-Weighting)

< 70µVrms

< 70µVrms

Crosstalk @ 1kHz

-96dB

-100dB

Input sensitivity

0.92Vrms

1.75Vrms

Gain

25.2dB

19.5dB

Channel balance

0.5dB

0.5dB

Output power

2x 80W @ 4Ω THD+N < 10%

2x 45W @ 8Ω THD+N < 10%

2x 65W @ 4Ω THD+N < 1%

colspan="2"2x 37W @ 4Ω THD+N < 1%

Adapter impedance

4-8Ω

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